The JJampong is really the best in town. Definitely worth it, even though it does cost more than other restaurants. After having theirs, I can't go to other places anymore.
The kalbi is very expensive and overpriced but the marination is just like LA kalbi, it is very good. Is it worth getting? Only if you have lots of money to spend or really craving LA style kalbi. It is the best marinated kalbi in town though.